import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		int a = scan.nextInt();
		int b = scan.nextInt();
		int c = scan.nextInt();
		
		if(a==1 || b==1 || c==1) {
			System.out.println(N);
			
		} else {
			long d = a * b / gcd(a , b);
	        long e = b * c / gcd(b , c);
	        long f = c * a / gcd(c , a);
	        long g = c * d / gcd(c , d);
	        long ans = N / a + N / b + N / c - (N / d + N / e + N / f) + N / g;
			System.out.println(ans);
		}
	}
	
	static long gcd(long a, long b) {
		long ans = 0;
		if(a == b) {
			ans = a;
		} else if(a > b) {
			ans = gcd(b, a-b);
		} else if(a < b) {
			ans = gcd(a, b-a);
		}
		return ans;
	}
}